scholarly journals Influence of tidal-range change and sediment compaction on Holocene relative sea-level change in New Jersey, USA

2013 ◽  
Vol 28 (4) ◽  
pp. 403-411 ◽  
Author(s):  
BENJAMIN P. HORTON ◽  
SIMON E. ENGELHART ◽  
DAVID F. HILL ◽  
ANDREW C. KEMP ◽  
DARIA NIKITINA ◽  
...  
Keyword(s):  
New Jersey ◽  
Sea Level ◽  
Sea Level Change ◽  
Tidal Range ◽  
Relative Sea Level ◽  
Level Change ◽  
Sediment Compaction ◽  
Range Change

Threshold Effects of Relative Sea-Level Change in Intertidal Ecosystems: Empirical Evidence from Earthquake-Induced Uplift on a Rocky Coast

GeoHazards ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 302-320
Author(s):  
Shane Orchard ◽  
Hallie S. Fischman ◽  
Shawn Gerrity ◽  
Tommaso Alestra ◽  
Robyn Dunmore ◽  
...  
Keyword(s):  
Sea Level ◽  
Sea Level Change ◽  
Vertical Displacement ◽  
Ecological Impacts ◽  
Tidal Range ◽  
Rocky Shores ◽  
Sea Level Changes ◽  
Relative Sea Level ◽  
Level Change ◽  
Rocky Coast

Widespread mortality of intertidal biota was observed following the 7.8 Mw Kaikōura earthquake in November 2016. To understand drivers of change and recovery in nearshore ecosystems, we quantified the variation in relative sea-level changes caused by tectonic uplift and evaluated their relationships with ecological impacts with a view to establishing the minimum threshold and overall extent of the major effects on rocky shores. Vertical displacement of contiguous 50 m shoreline sections was assessed using comparable LiDAR data to address initial and potential ongoing change across a 100 km study area. Co-seismic uplift accounted for the majority of relative sea-level change at most locations. Only small changes were detected beyond the initial earthquake event, but they included the weathering of reef platforms and accumulation of mobile gravels that continue to shape the coast. Intertidal vegetation losses were evident in equivalent intertidal zones at all uplifted sites despite considerable variation in the vertical displacement they experienced. Nine of ten uplifted sites suffered severe (>80%) loss in habitat-forming algae and included the lowest uplift values (0.6 m). These results show a functional threshold of c.1/4 of the tidal range above which major impacts were sustained. Evidently, compensatory recovery has not occurred—but more notably, previously subtidal algae that were uplifted into the low intertidal zone where they ought to persist (but did not) suggests additional post-disturbance adversities that have contributed to the overall effect. Continuing research will investigate differences in recovery trajectories across the affected area to identify factors and processes that will lead to the regeneration of ecosystems and resources.

scholarly journals Corrigendum: Late Devensian and Holocene relative sea-level change in North Wales, UK

2011 ◽  
Vol 26 (7) ◽  
pp. 768-768
Author(s):  
M. J. Roberts ◽  
J. D. Scourse ◽  
J. D. Bennell ◽  
D. G. Huws ◽  
C. F. Jago ◽  
...  
Keyword(s):  
Sea Level ◽  
Sea Level Change ◽  
Relative Sea Level ◽  
Level Change ◽  
North Wales

scholarly journals Relative sea‐level change and postglacial isostatic adjustment along the coast of south Devon, United Kingdom

2008 ◽  
Vol 23 (5) ◽  
pp. 415-433 ◽  
Author(s):  
Anthony C. Massey ◽  
W. Roland Gehrels ◽  
Dan J. Charman ◽  
Glenn A. Milne ◽  
W. Richard Peltier ◽  
...  
Keyword(s):  
United Kingdom ◽  
Sea Level ◽  
Sea Level Change ◽  
Relative Sea Level ◽  
Level Change ◽  
Isostatic Adjustment

Historical rates of salt marsh accretion on the outer Bay of Fundy

2001 ◽  
Vol 38 (7) ◽  
pp. 1081-1092 ◽  
Author(s):  
Gail L Chmura ◽  
Laurie L Helmer ◽  
C Beth Beecher ◽  
Elsie M Sunderland
Keyword(s):  
Salt Marsh ◽  
Sea Level ◽  
Sea Level Change ◽  
Bay Of Fundy ◽  
Relative Sea Level ◽  
Early 19Th Century ◽  
Level Change ◽  
Pollen Stratigraphy ◽  
Accretion Rates ◽  
Marsh Accretion

We examine rates of salt marsh accumulation in three marshes of the outer Bay of Fundy. At each marsh we selected a site in the high marsh with similar vegetation, and thus similar elevation. Accretion rates were estimated by 137Cs, 210Pb, and pollen stratigraphy to estimate rates of change over periods of 30, 100, and ~170 years, respectively. These rates are compared with records from the two closest tide gauges (Saint John, New Brunswick, and Eastport, Maine) to assess the balance of recent marsh accretion and sea-level change. Averaged marsh accretion rates have ranged from 1.3 ± 0.4 to 4.4 ± 1.6 mm·year–1 over the last two centuries. Recent rates are similar to the rate of sea-level change recorded at Eastport, Maine, suggesting that they are in step with recent sea-level change but very sensitive to short-term variation in relative sea level. Based on the pollen stratigraphy in the marsh sediments, the marsh accretion rate was higher during the late 18th to early 19th century. Higher rates probably were due to local increases in relative sea level as a result of neotectonic activity and may have been enhanced by increased sediment deposition through ice rafting.

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